I have these small pimples with water inside it started with one on my lip then the next day more & more appeared. Once popped it becomes like a scab?

Possibly cold sore. A cold sore (herpes simplex virus infection) looks like a group of vesicles with redness and swelling, usually on the lips. Usually starts with itching, tingling or tenderness. They do scab once the healing has begun. While the vesicles are still not scabbed, it is contagious to yourself and others, so please avoid touching it. Your doctor can prescribe an antiviral medication to treat this.